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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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It is 3, its about how many times you do the operation, not what the actual result is. So for 39 you do 3 * 9 = 27, 2 * 7 = 14, 1 * 4 = 4, 4 is a single digit, and you had to perform 3 operations to get to a single digit answer, so your answer is 3 operations. It confused me too.